A radioactive source is placed very close to a detector that is connected to a counter.
The reading on the counter shows how much radiation is reaching the detector.
The table shows the original reading and the readings when the radiation is travelling perpendicular to an electric field or a magnetic field.
Which types of radiation are emitted by the source?
1 )
alpha-particles and beta-particles
2 )
alpha-particles only
3 )
beta-particles only
gamma-rays only
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